I'm headed to London soon and haven't booked a show. I love musicals and plays both. Anything that you've seen that you highly recommend?

We just saw The Ferryman and thought it was the best play we have seen! It’s about a Northern Ireland family and the IRA during the Troubles. Intense but very good!

http://theatremonkey.com/
This big guide to London theatre includes such helpful advice as descriptions of theatres including the location of obstructed-view seats. It gives some sense of what has had long runs and why, and whether the original cast is still in place. Many of the hit musicals are more international than British, running on both sides of the Atlantic. Comedies can be more distinctively local.

I just booked it! Thanks!

Have you seen Dreamgirls? Saw it at the Savoy and I think it may still be running

Thank you, jamikins! It was simply fabulous. Absolutely wonderful.
Mary Carney was played tonight by Caoimhe Farren. A marvelous cast. I would travel to see Owen McDonnell in something else. I'm going to check out his movies, as well as those by "Tom Kettle" and "Aunt Maggie Far Away".

I think you so much for your recommendation!

My pleasure, I am so pleased that you enjoyed it! It was fantastic, wasn't it! The time flew by given how long the show is. Enjoy your time in London!